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/*
 * Copyright 2015 Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.onosproject.net.device;

/**
 * Statistics of a port.
 */
public interface PortStatistics {

    /**
     * Returns the port number.
     *
     * @return port number
     */
    int  port();

    /**
     * Returns the number of packets received.
     *
     * @return the number of packets received
     */
    long packetsReceived();

    /**
     * Returns the number of packets sent.
     *
     * @return the number of packets sent
     */
    long packetsSent();

    /**
     * Returns the bytes received.
     *
     * @return the bytes received
     */
    long bytesReceived();

    /**
     * Returns the bytes sent.
     *
     * @return the bytes sent
     */
    long bytesSent();

    /**
     * Returns the number of packets dropped by RX.
     *
     * @return the number of packets dropped by RX
     */
    long packetsRxDropped();

    /**
     * Returns the number of packets dropped by TX.
     *
     * @return the number of packets dropped by TX
     */
    long packetsTxDropped();

    /**
     * Returns the number of transmit errors.
     *
     * @return the number of transmit errors
     */
    long packetsRxErrors();

    /**
     * Returns the number of receive errors.
     *
     * @return the number of receive error
     */
    long packetsTxErrors();

    /**
     * Returns the time port has been alive in seconds.
     *
     * @return the time port has been alive in seconds
     */
    long durationSec();

    /**
     * Returns the time port has been alive in nano seconds.
     *
     * @return the time port has been alive in nano seconds
     */
    long durationNano();

}